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onyerbike
Under the circumstances I don't think I'd be able to measure my own heartrate to a degree any more accurate than 'going like the clappers'.
And I certainly know that I'm under major physiological stress, we beyond just going into the red. While it's happened I have tried adjusting the strap and sitting up and pressing the contact patches against my chest to see if that had any effect. I just think that if it was interference or a dodgy strap, it should be more random or erratic rather than producing a graph that would look perfectly normal if you scaled down the bpm numbers so the peak was 180 rather than 230.
Time to see the GP, I think if only for peace of mind.